module.exports = {
    checkLogin: function(req, res, next) {
        if(!req.session.user) {
            req.flash('error', '未登录')
            return res.redirect('/signin')
        }
        next()
    },

   checkNotLogin: function(req, res, next) {
       if(req.session.user) {
           req.flash('error', '已登录')
           return res.redirect('back') // 返回之前的页面
       }
       next()
   }
}